[R-390] HP-410B Question

[Barry]

That's what I figured.  While the meter will function without that 50uF, I think I will replace it.  I really like the damped meter movement on these VTVMs.

Thanks,
Barry - N4BUQ


 On Sat 19/02/11  8:30 PM , Randy and Sherry Guttery comcents at bellsouth.net sent:
> On 2/19/2011 7:42 PM, Barry wrote:
> > I have an HP-410B that I'm restoring.  It has a
> small value cap (5000pf or so) across the meter but it also has a 50uF cap
> across the meter as well.  I've been advised to just remove that 50uF cap
> as it isn't really needed (it's not on some of the newer
> models).Disclaimer - *I* don't know - just passing on what someone 
> else told me (who happened to be a design engineer at HP at 
> the time) -
> 
> When I asked why two caps - he noted that the smaller cap was to bypass any
> RF that might leak into the meter movement from the front - since the
> shielding wasn't all that good there... and the larger one was to slow down
> the response so the pointer and the rest of the works didn't "slam" off the
> stops so hard on an overload...
> He too noted that the larger caps had been left out of later 
> production units.
> 
> best regards...
> 
> -- 
> randy guttery
> 
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> 
>